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Is the clay "exchange capacity" concept wholly applicable to pozzolans?
One of the most characteristic properties of clays is their "cation exchange capacity", otherwise known as their "exchange capacity ". The research reported in this article shows that for various reasons some natural and artificial pozzolans exhibit this property. Ion exchange is only partial in the latter however bec…
Performance of alkaline activated slag at high temperatures
This paper presents an investigation into the performance of alkali-activated slag (AAS) mortar exposed to elevated temperatures. Sodium silicate, sodium hydroxide and a mix (waterglass) with a modulus (SiO2/Na20) of 1.5 were used as activators. The specimens were heated in an electric furnace up to 1000 ºC in steps o…
Wood-polymer composite: physical and mechanical properties of some wood species impregnated with styrene and methyl methacrylate
This study aimed to demonstrate the feasibility of obtaining wood-polymer composites (WPC) displaying a performance superior to that of untreated wood from reforested genera. To this end, wood samples of Pine (Pinus caribaea) and Eucalyptus (Eucalyptus grandis), whose density is compatible with this process, were impr…
4th Conference on Modelling and Simultation in Medicine
Nordic Rheology Conference 2004
A Comprehensive Treatise of the High Temperature Specification Parameter |G*|/(1-(1/tanδsinδ)) for Performance Grading of Asphalts
The term |G*|/(1-(1/tanδ sinδ)) has been suggested as one of the best candidates for the replacement of the Super-pave specification parameter |G*|/sinδ, which has been found to be inadequate in rating polymer-modified binders for high temperature performance grading. This refinement of the Superpave specification par…
TABLE OF CONTENTS
Thermal Stress Analysis in Orthotropic Rotating Discs
Hygrothermal Aging Effect on the Interlaminar Fracture of Woven Fabric Fibre/ PEI Composite Material
In vitro bioactivity and cytotoxicity of chemically treated glass fibers
Samples of a commercial glass fiber FM® (Fiber Max) were used to test the efficacy of a chemical sol-gel surface treatment to enhance their bioactivity. After treatment with tetraethoxysilane (TEOS), individual fiber samples were soaked into a simulated body fluid (SBF) solution, from which they were removed at interv…
Zeta potential measurement in bioactive collagen
The focus of this work is to show the influence of surface charge on the bioactivity of modified collagen fiber surface. Because silica plays an important role on bone mineralization process, silica obtained by a sol-gel process was used as a surface modification agent. Zeta potential (xi) of silica-coated and non-coa…
An Elasto-Plastic Stress Analysis of Simply Supported Thermoplastic Composite Beams under a Transverse Linearly Distributed Load
Dynamic and Scale Effects on Reinforced Concrete Beam-Column Joint Structures
A 5-Axes Filament Winder with Software Control
Effect of Particle Rotations on the Interface Behaviour between a Granular Layer and Parallel Rough Plates
Saturated salt method determination of hysteresis of Pinus sylvestris L. wood for 35 ºC isotherms
The saturated salts method was used in this study to quantify hysteresis in Pinus sylvestris L. wood, in an exercise that involved plotting the 35 ºC desorption and sorption isotherms. Nine salts were used, all of which establish stable and known relative humidity values when saturated in water The wood was kept at th…
Ceramic foams porous microstructure characterization by X-ray microtomography
Knowledge of the porous structure of amorphous materials is of fundamental importance in calculating geometrical parameters such as total porosity, pore size distribution and physical parameters relating to fluid flow inside void space. The present work deals with the measurement of the microstructural parameters of p…
Giant magnetocaloric effect in Gd5(Si2Ge2) alloy with low purity Gd
Gd5(Ge1-xSi x), x < 4 based alloys are potential candidates for magnetic refrigeration in the range ~20 - ~290 K. However, one of the greatest obstacles for the use of that technology in large scale is the utilization of high pure Gd metal (99.99 wt. (%)) to produce the GdGeSi alloys, since the impurity elements decre…